I actually though I heard him say 300k, As to the post you quoted, how do we know premium subs are around 20k?
The 20k number is really old. It's what they said at the start of the third(?) BLLSL. Might be the second. From what Jeff has said it's pretty safe to assume that the number is significantly higher now.
edit: they were at 18 490 subs at the start of the third BLLSL in September 2012, so that number is really outdated now.